{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:UDQS3OCBIBB6UEDTJBYCXLV3JG","short_pith_number":"pith:UDQS3OCB","canonical_record":{"source":{"id":"2109.06843","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-09-14T17:30:31Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"f2b7c08f5a310d4a639b4dfc1c6eaf79252679f90cb631a8153f956d3194186e","abstract_canon_sha256":"a1eb669045a642dd261f165b2e97b51b919a0cfec1e8e92067b617bd360ddf7a"},"schema_version":"1.0"},"canonical_sha256":"a0e12db8414043ea107348702baebb499d53d78c67d7e6a2c5d5ad9b8e8ebddb","source":{"kind":"arxiv","id":"2109.06843","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.06843","created_at":"2026-07-05T03:32:38Z"},{"alias_kind":"arxiv_version","alias_value":"2109.06843v1","created_at":"2026-07-05T03:32:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.06843","created_at":"2026-07-05T03:32:38Z"},{"alias_kind":"pith_short_12","alias_value":"UDQS3OCBIBB6","created_at":"2026-07-05T03:32:38Z"},{"alias_kind":"pith_short_16","alias_value":"UDQS3OCBIBB6UEDT","created_at":"2026-07-05T03:32:38Z"},{"alias_kind":"pith_short_8","alias_value":"UDQS3OCB","created_at":"2026-07-05T03:32:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:UDQS3OCBIBB6UEDTJBYCXLV3JG","target":"record","payload":{"canonical_record":{"source":{"id":"2109.06843","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-09-14T17:30:31Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"f2b7c08f5a310d4a639b4dfc1c6eaf79252679f90cb631a8153f956d3194186e","abstract_canon_sha256":"a1eb669045a642dd261f165b2e97b51b919a0cfec1e8e92067b617bd360ddf7a"},"schema_version":"1.0"},"canonical_sha256":"a0e12db8414043ea107348702baebb499d53d78c67d7e6a2c5d5ad9b8e8ebddb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:32:38.862674Z","signature_b64":"A6zcqere2dYobluihTGrMU/z/QJ4A+weoP47qNhFht18CV2QeJJJRGTMJcg6GTACH4rk96+BNZkl6rmFD6oGCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a0e12db8414043ea107348702baebb499d53d78c67d7e6a2c5d5ad9b8e8ebddb","last_reissued_at":"2026-07-05T03:32:38.862177Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:32:38.862177Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2109.06843","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:32:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"A252lX9BDdbtNqV858woYGnK4u4C8l0oy/FpfU0uIAQemKpEkIa8bNBcdF+0ojJmIFmEK4eeMgT7lGXztZ04Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T14:57:44.677280Z"},"content_sha256":"c743d65d7eaeafa4d400070be16da6337a271f1af84a3d1c4ff0065f4487345b","schema_version":"1.0","event_id":"sha256:c743d65d7eaeafa4d400070be16da6337a271f1af84a3d1c4ff0065f4487345b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:UDQS3OCBIBB6UEDTJBYCXLV3JG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Tunneling dynamics in cosmological bounce models","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th"],"primary_cat":"gr-qc","authors_text":"Brenda Jones, Martin Bojowald","submitted_at":"2021-09-14T17:30:31Z","abstract_excerpt":"Quasiclassical methods are used to define dynamical tunneling times in models of quantum cosmological bounces. These methods provide relevant new information compared with the traditional treatment of quantum tunneling by means of tunneling probabilities. As shown here, the quantum dynamics in bounce models is not secure from reaching zero scale factor, re-opening the question of how the classical singularity may be avoided. Moreover, in the examples studied here, tunneling times remain small even for large barriers, highlighting the quantum instability of underlying bounce models."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.06843","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2109.06843/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:32:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"41tZUVXcnMh8NkrLHbg95IfmKZ747pOeYgUGDBwH0Srw+g7REUIrX38nxhSOKn9/MdNWsr5+MsjBNdth2pJcDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T14:57:44.678486Z"},"content_sha256":"3134610eea6ed6063f7ba93ad040d4c83ba22d840198bfbd26817b7d8feae1c8","schema_version":"1.0","event_id":"sha256:3134610eea6ed6063f7ba93ad040d4c83ba22d840198bfbd26817b7d8feae1c8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UDQS3OCBIBB6UEDTJBYCXLV3JG/bundle.json","state_url":"https://pith.science/pith/UDQS3OCBIBB6UEDTJBYCXLV3JG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UDQS3OCBIBB6UEDTJBYCXLV3JG/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-15T14:57:44Z","links":{"resolver":"https://pith.science/pith/UDQS3OCBIBB6UEDTJBYCXLV3JG","bundle":"https://pith.science/pith/UDQS3OCBIBB6UEDTJBYCXLV3JG/bundle.json","state":"https://pith.science/pith/UDQS3OCBIBB6UEDTJBYCXLV3JG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UDQS3OCBIBB6UEDTJBYCXLV3JG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:UDQS3OCBIBB6UEDTJBYCXLV3JG","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"a1eb669045a642dd261f165b2e97b51b919a0cfec1e8e92067b617bd360ddf7a","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-09-14T17:30:31Z","title_canon_sha256":"f2b7c08f5a310d4a639b4dfc1c6eaf79252679f90cb631a8153f956d3194186e"},"schema_version":"1.0","source":{"id":"2109.06843","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.06843","created_at":"2026-07-05T03:32:38Z"},{"alias_kind":"arxiv_version","alias_value":"2109.06843v1","created_at":"2026-07-05T03:32:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.06843","created_at":"2026-07-05T03:32:38Z"},{"alias_kind":"pith_short_12","alias_value":"UDQS3OCBIBB6","created_at":"2026-07-05T03:32:38Z"},{"alias_kind":"pith_short_16","alias_value":"UDQS3OCBIBB6UEDT","created_at":"2026-07-05T03:32:38Z"},{"alias_kind":"pith_short_8","alias_value":"UDQS3OCB","created_at":"2026-07-05T03:32:38Z"}],"graph_snapshots":[{"event_id":"sha256:3134610eea6ed6063f7ba93ad040d4c83ba22d840198bfbd26817b7d8feae1c8","target":"graph","created_at":"2026-07-05T03:32:38Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2109.06843/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Quasiclassical methods are used to define dynamical tunneling times in models of quantum cosmological bounces. These methods provide relevant new information compared with the traditional treatment of quantum tunneling by means of tunneling probabilities. As shown here, the quantum dynamics in bounce models is not secure from reaching zero scale factor, re-opening the question of how the classical singularity may be avoided. Moreover, in the examples studied here, tunneling times remain small even for large barriers, highlighting the quantum instability of underlying bounce models.","authors_text":"Brenda Jones, Martin Bojowald","cross_cats":["hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-09-14T17:30:31Z","title":"Tunneling dynamics in cosmological bounce models"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.06843","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:c743d65d7eaeafa4d400070be16da6337a271f1af84a3d1c4ff0065f4487345b","target":"record","created_at":"2026-07-05T03:32:38Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"a1eb669045a642dd261f165b2e97b51b919a0cfec1e8e92067b617bd360ddf7a","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-09-14T17:30:31Z","title_canon_sha256":"f2b7c08f5a310d4a639b4dfc1c6eaf79252679f90cb631a8153f956d3194186e"},"schema_version":"1.0","source":{"id":"2109.06843","kind":"arxiv","version":1}},"canonical_sha256":"a0e12db8414043ea107348702baebb499d53d78c67d7e6a2c5d5ad9b8e8ebddb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a0e12db8414043ea107348702baebb499d53d78c67d7e6a2c5d5ad9b8e8ebddb","first_computed_at":"2026-07-05T03:32:38.862177Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:32:38.862177Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"A6zcqere2dYobluihTGrMU/z/QJ4A+weoP47qNhFht18CV2QeJJJRGTMJcg6GTACH4rk96+BNZkl6rmFD6oGCA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:32:38.862674Z","signed_message":"canonical_sha256_bytes"},"source_id":"2109.06843","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c743d65d7eaeafa4d400070be16da6337a271f1af84a3d1c4ff0065f4487345b","sha256:3134610eea6ed6063f7ba93ad040d4c83ba22d840198bfbd26817b7d8feae1c8"],"state_sha256":"4fe5f2fded9cbb14b8841cebe0bf3f7591fd38a5c50c36b97e24984d1cd1e1b2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/7Z620GRFoP08+FtKpw2pa4tNmxsrUSa7QAZ7Wr1UqLNZ05xvPMZiMK4oqfnkUemri5yL56xkMaUdhOzlmWdCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-15T14:57:44.687111Z","bundle_sha256":"6cb35ae2d07615defa6cc20e065a6967cc550507cc41b4a797e8f34f1a40e59e"}}